Toyo, I am curious about the Zorki cameras - a friend has one to sell. What are they like to use? How good is the f3.5 Industrar lens? Thanks!
They are somewhat like a Leica to use and very easy to manage in the hand. The viewfinder has a built-in diopter which I like.
Film wind-on is an acquired taste as the knob is a little snug. The Zorki 4K has a lever which is easier, but it doesn't look as cool

The 3.5 Industar is a very good lens, but my favourite is the Jupiter 8, which can still be found cheaply if you shop around.
The film take-up spool is not fixed and comes out of course - so make sure it is present. Of course you can buy replacements on ebay if not.
I have a Zorki 4 which I have been using a lot, but have been after a 3M at a decent price for a long time before this one popped up.
I really like the lines of the 3M
Oh - if you do get one, always wind on and cock the shutter before changing film speeds
T